Ameghiniana最新文献_第6页

Upper Pennsylvanian Age of the Lower Talchir Formation in the Wardha Basin, Central India, Based on Guide Palynomorphs Present in Radiometrically-Dated Palynozonations in South America, Africa, and Australia 印度中部Wardha盆地下Talchir组的上宾夕法尼亚时代——基于南美洲、非洲和澳大利亚辐射定年孢粉带中的Guide孢粉形态

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-08-31 DOI: 10.5710/AMGH.29.03.2021.3423

P. S. Kavali, A. Roy, M. Pasquo, G. P. Gurumurthy, Gaurav Sharma, Ajit Kumar

{"title":"Upper Pennsylvanian Age of the Lower Talchir Formation in the Wardha Basin, Central India, Based on Guide Palynomorphs Present in Radiometrically-Dated Palynozonations in South America, Africa, and Australia","authors":"P. S. Kavali, A. Roy, M. Pasquo, G. P. Gurumurthy, Gaurav Sharma, Ajit Kumar","doi":"10.5710/AMGH.29.03.2021.3423","DOIUrl":"https://doi.org/10.5710/AMGH.29.03.2021.3423","url":null,"abstract":"Abstract. The age of the Talchir Formation corresponding to the lower part of the Gondwana (Permo–Carboniferous) Sequence in India is revised in the light of palynostratigraphic data associated with radiometric dating generated in Gondwana. New data was generated from seven samples of the Talchir Formation obtained from Well 131, located in the Penganga area of Wardha Valley Coalfield (Maharashtra State, central India). Two assemblages were demarcated based on the stratigraphic distribution of 63 species of spores (23 taxa), pollen grains (35 taxa), and phytoplankton. Palynoassociation I recognized in the two basal samples yielded few Punctatisporites spores and monosaccate pollen grains. Palynoassociation II is demarcated in the overlying three samples characterized by spores and pollen grains that are more diversified and abundant than in the other two samples. Several taxa (Concavissimisporites grumulus, Converrucosisporites confluens, Cyclogranisporites gondwanensis, Verrucosisporites andersonii, Latusipollenites quadrisaccatus, Marsupipollenites striatus, Pakhapites fusus, Striatoabieites multistriatus, Vittatina subsaccata, Vittatina vittifera) are shared with palynozones radiometrically constrained to the latest Pennsylvanian–early Cisuralian in Argentina, Brazil, Africa, and Australia. Therefore, we propose a Kasimovian to Ghezelian–Asselian age for the palynoassociations I and II of the Talchir Formation and a correlation with the Potonieisporites neglectus and Plicatipollenites gondwanensis Zones of Tiwari & Tripathi, respectively. This approach significantly improves the stratigraphic correlations of the Indian palynozones in Gondwana.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"58 1","pages":"318 - 344"},"PeriodicalIF":1.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45903468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Forward to the Past: A Romp through the Nature of the Last Half-Billion Years 展望过去:在过去5亿年的自然中嬉戏

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-08-31 DOI: 10.5710/1851-8044-58.4.376

A. Tomescu, Allison W. Bronson

引用次数: 0

Palynology of the Early to Middle Devonian Pescado Formation, Subandean Range, Salta Province, Argentina 阿根廷萨尔塔省Subandean Range早至中泥盆世Pescado组孢粉学

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-08-31 DOI: 10.5710/AMGH.25.05.2021.3413

J. Pineda, S. Noetinger, E. Ottone

{"title":"Palynology of the Early to Middle Devonian Pescado Formation, Subandean Range, Salta Province, Argentina","authors":"J. Pineda, S. Noetinger, E. Ottone","doi":"10.5710/AMGH.25.05.2021.3413","DOIUrl":"https://doi.org/10.5710/AMGH.25.05.2021.3413","url":null,"abstract":"Abstract. We present the palynoflora recovered from the Pescado Formation in the Subandean Range, Salta Province, Argentina. The palynological assemblage comprises well-preserved marine and terrestrial palynomorphs, including cryptospores (one species), trilete spores (16 species), acritarchs (six species), prasinophytes (three species), and chlorophytes (three species). Based on the quantitative analysis and stratigraphic distribution of palynomorphs, two palynological associations are recognized (RC1, RC2). The presence of Dictyotriletes emsiensis morphon and Acinosporites apiculatus, together with Duvernaysphaera angelae and D. tenuicingulata, suggests a late Emsian–Eifelian age for RC1 and RC2. The studied assemblages contain many taxa in common with other coeval assemblages of Gondwana that confirm the paleogeographical relationships among the Argentine Precordillera, the Tarija Basin, and the southern Chacoparaná Basin in Uruguay. The relative abundance of the palynomorphs encountered suggests a marine depositional environment close to the paleo-shoreline for the RC1, and a more distal marine setting for the RC2, possibly nearshore, reflecting the Eifelian transgression. This event, already documented by different authors, is also recognized in the southern portion of the Tarija Basin.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"58 1","pages":"301 - 317"},"PeriodicalIF":1.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43989198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The Evolution and Fossil Record of Parasitism. Identification and Macroevolution of Parasites 寄生的进化和化石记录。寄生虫的鉴定与宏观进化

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-07-14 DOI: 10.5710/1851-8044-58.3.299

K. Baets, J. Huntley

引用次数: 1

Biological Consequences of Plate Tectonics: New Perspectives on Post-Gondwana Break-Up—A Tribute to Ashok Sahni 板块构造的生物学后果:冈瓦纳板块分裂后的新视角——致Ashok Sahni

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-07-14 DOI: 10.5710/1851-8044-58.3.297

F. Abdala

引用次数: 0

A New Basal Notoungulate from the Itaboraí Basin (Paleogene) of Brazil 巴西Itaboraí盆地(古近系)一种新的基底无蹄类

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-06-30 DOI: 10.5710/AMGH.05.02.2021.3387

Luis Otavio Rezende Castro, D. Garcia-Lopez, L. Bergqvist, H. I. de Araújo‐Júnior

{"title":"A New Basal Notoungulate from the Itaboraí Basin (Paleogene) of Brazil","authors":"Luis Otavio Rezende Castro, D. Garcia-Lopez, L. Bergqvist, H. I. de Araújo‐Júnior","doi":"10.5710/AMGH.05.02.2021.3387","DOIUrl":"https://doi.org/10.5710/AMGH.05.02.2021.3387","url":null,"abstract":"Abstract. A new basal notoungulate, Nanolophodon tutuca gen. et sp. nov., is described. This is represented by maxillary and dental fragments and by isolated teeth. The holotype and referred material were found at the “1968 Fissure” of the Itaboraí Basin, Rio de Janeiro State, Brazil. This basin has been regarded as early Eocene in recent contributions. The generalized appearance and brachydonty of the studied specimens, together with the presence of certain typical traits (poorly developed entolophid, well-developed metacone column, etc.) indicate that N. tutuca can be considered among the group of genera traditionally known as henricosborniids, easily distinguishable from Typotheria by the absence of crista 1 and from Toxodontia by the absence of crista intermedia. It is also different from all other henricosborniids by a combination of characters, such as the presence of a long crochet, the development of two small cristae in the ectoloph, and the large paraconid, among others. In the context of a phylogenetic analysis performed, we do not find conclusive evidence about the synonymy between Itaboraitherium atavum and Othnielmarshia pristina. In turn, we question the reference of these forms as henricosborniids, based on the complex occlusal dental pattern observed in both cases. Finally, based on the observations made in the present study, we discuss the identification of the paraconid in notoungulates, which may be associated with some cusps located mesially to the metaconid and identified as pseudoparaconids in past studies.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"58 1","pages":"272 - 288"},"PeriodicalIF":1.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46431198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Palaeomohria Spores from the Cenomanian in Patagonia, Argentina 阿根廷巴塔哥尼亚Cenomanian的古莫氏菌孢子

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-06-30 DOI: 10.5710/AMGH.22.02.2021.3407

P. Santamarina, V. Barreda, A. Iglesias, A. Varela

引用次数: 2

New Palynological Data of the Cerro de las Cabras Formation (Middle Triassic) at its Type Locality, Mendoza, Argentina. Biostratigraphic and Phytogeographic Implications 阿根廷门多萨中三叠统Cerro de las Cabras组模式地点孢粉学新资料。生物地层学和植物地理学意义

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-06-30 DOI: 10.5710/AMGH.19.03.2021.3415

L. J. Ruffo Rey

{"title":"New Palynological Data of the Cerro de las Cabras Formation (Middle Triassic) at its Type Locality, Mendoza, Argentina. Biostratigraphic and Phytogeographic Implications","authors":"L. J. Ruffo Rey","doi":"10.5710/AMGH.19.03.2021.3415","DOIUrl":"https://doi.org/10.5710/AMGH.19.03.2021.3415","url":null,"abstract":"Abstract. This palynological study presents a systematic update of the Cerro de Las Cabras Formation at its type section. Thirty-three genera and 81 species of palynomorphs are incorporated, including forms recorded for the first time in the Triassic of Argentina. Additionally, 53 forms of palynomorphs were synonymized with new or already known species of the unit from the taxonomic revision of previously published material. Four new combinations were proposed: Secarisporites argenteiformis, S. lobatoverrucosus, S. verrucosus and S. volkheimerii. The palynoflora is dominated by species of the Alisporites/Falcisporites, the Cycadopites/Monosulcites, the Secarisporites/Leptolepidites, and the Densoisporites/Lundbladispora complexes. The locally common presence of Illinites (∼14%), cf. Rimaesporites (∼4%), Minutosaccus (∼2.7%), Staurosaccites (∼2.3%), Protodiploxypinus (∼2%), Angustisulcites (∼1.7%), and Brachysaccus (∼1.7%) is noteworthy. The Permian taxa Cladaitina sp., Limitisporites rectus, Lueckisporites sp., Platysaccus sp. cf. P. trumpii, Protohaploxypinus goraiensis, Punctatisporites gretensis, and Retusotriletes sp. cf. R. nigritellus are interpreted to occur in situ. The common presence of typical north-central European species such as Illinites chitonoides and Illinites kosankei, along with the co-occurrences of Densoisporites playfordii, Angustisulcites gorpii, Ovalipollis notabilis, Samaropollenites speciosus, and Staurosaccites quadrifidus, enable the constraining of the age of the palynoflora to the late Anisian–early Ladinian. On the other hand, the present study reveals a greater number of species shared with the Northern Hemisphere and low-mid latitudes of Gondwana, including typical Onslow elements such as cf. Rimaesporites aquilonalis, Samaropollenites speciosus, Staurosaccites quadrifidus, and Minutosaccus crenulatus, which allow us to ascribe the studied assemblage to a mixed Onslow-Ipswich palynoflora.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"58 1","pages":"181 - 206"},"PeriodicalIF":1.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48605630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Silurian and Devonian Modiomorphidae Bivalves from Bolivia 玻利维亚志留纪和泥盆纪双足目

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-06-30 DOI: 10.5710/AMGH.07.01.2021.3400

A. D. Farjat

{"title":"Silurian and Devonian Modiomorphidae Bivalves from Bolivia","authors":"A. D. Farjat","doi":"10.5710/AMGH.07.01.2021.3400","DOIUrl":"https://doi.org/10.5710/AMGH.07.01.2021.3400","url":null,"abstract":"Abstract. Modiomorphid bivalves from the Silurian and Devonian beds of the Central Andean Basin of Western Gondwana are herein presented. This paper is not only a systematic updated revision of certain species of modiomorphids but also includes the description of newly found ones in Bolivia. They were collected from 17 scattered outcrops along Eastern Cordillera, Eastern Altiplano, Interandean, and Subandean regions of Bolivia. A total of 55 specimens, well- to regularly-preserved, were studied. The Sphenotomorpha orientalis new species from the Interandean of Mataral is described. The genus Sphenotomorpha is reported for the first time from Ludlowian layers of the Central Andean Basin with Sphenotomorpha sp. A. Other species described and systematically discussed are Modiomorpha concentrica, Modiomorpha cf. pimentana, Sphenotomorpha ulrichi and Sphenotomorpha cf. bodenbenderi? Forms classified as Modiomorphidae indet. A, B, and C are studied and some discussions about their previous and current taxonomic designations are herein presented. The biostratigraphic distribution of the two cosmopolitan genera, Sphenotomorpha, 1916, and Modiomorpha, 1869, is proposed. From the Eifelian to the Frasnian, endobyssal forms, such as Modiomorpha concentrica, coexisted with foot forms like Modiomorphidae indet. C and Sphenotomorpha sp. B, which would have developed a discreet byssus. This research contributes to the still inaccurately known Silurian and Devonian palaeogeography of the Central Andean Basin.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"58 1","pages":"242 - 271"},"PeriodicalIF":1.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46185850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Late Pleistocene Palaeoenvironmental Variations from Marine Isotope Stages 5 and 4: Small Mammals at Artazu VIII Site (Arrasate, Northern Iberian Peninsula) 晚更新世海洋同位素阶段5和4的古环境变化:北伊比利亚半岛Artazu VIII遗址(Arrasate)的小型哺乳动物

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-06-30 DOI: 10.5710/AMGH.30.11.2020.3404

Aitziber Suárez-Bilbao, Naroa García-Ibaibarriaga, J. Ortiz, T. Torres, A. Arrizabalaga, M. Iriarte-Chiapusso, X. Murelaga

{"title":"Late Pleistocene Palaeoenvironmental Variations from Marine Isotope Stages 5 and 4: Small Mammals at Artazu VIII Site (Arrasate, Northern Iberian Peninsula)","authors":"Aitziber Suárez-Bilbao, Naroa García-Ibaibarriaga, J. Ortiz, T. Torres, A. Arrizabalaga, M. Iriarte-Chiapusso, X. Murelaga","doi":"10.5710/AMGH.30.11.2020.3404","DOIUrl":"https://doi.org/10.5710/AMGH.30.11.2020.3404","url":null,"abstract":"Abstract. Sites corresponding to Marine Isotope Stage MIS 5c and MIS 4 like Artazu VIII, with a continental record but no hominin imprints or carnivore activities, are very scarce in the Iberian Peninsula. The Artazu VIII cave fill (Arrasate, northern Spain) was discovered in 2013 and is presented here for the first time, including detailed stratigraphic and sedimentological descriptions of the differentiated 12 levels, as well as an ordered chronology of most levels, covering at least 36.000 years. In addition, the small mammal assemblage yielded a total of 8,129 identifiable skeletal remains corresponding to 14 taxa. The conditions inferred from the ecological preferences of the small mammal associations have been correlated with four different stages and substages from MIS 5c to MIS 4 in which the woodland mass expanded and retreated, depending on the relative temperature and humidity in each period. Finally, considering the species variability and estimated palaeoenvironment, a comparison with the NGRIP δ18O curve and other sites with the same chronology has been performed, showing that Artazu VIII is one of the few deposits attributable to the Marine Isotopic Stages previously mentioned and the only one that correlates to the Greenland Interstadial 18 from the Iberian Peninsula.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"58 1","pages":"223 - 241"},"PeriodicalIF":1.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43920296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0